/* 
 * T–R Stereo Difference Simulator – Styles
 * Developed by Wonderweb Technologies
 */

:root {
    --tr-bg: #1a1d23;
    --tr-surface: #262b33;
    --tr-border: #3d4552;
    --tr-text: #e8edf3;
    --tr-text-secondary: #9aa4b3;
    --tr-accent: #82b1ff;
    --tr-accent-hover: #b388ff;
    --tr-shadow: rgba(0, 0, 0, 0.6);
    --tr-radius: 20px;
    --tr-font: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

.tr-stereo-difference-app {
    max-width: 720px;
    margin: 0 auto;
    background: var(--tr-bg);
    border-radius: var(--tr-radius);
    padding: 28px 24px 24px;
    box-shadow: 0 16px 32px var(--tr-shadow);
    color: var(--tr-text);
    font-family: var(--tr-font);
    transition: background 0.2s;
}

.tr-stereo-difference-app h1 {
    font-size: 1.6rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #b388ff, #82b1ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0 0 4px 0;
    padding: 0;
}
.tr-stereo-difference-app .subtitle {
    font-size: 0.9rem;
    color: var(--tr-text-secondary);
    border-left: 3px solid #5c6b7e;
    padding-left: 14px;
    margin: 0 0 18px 0;
}
.tr-stereo-difference-app .subtitle strong {
    color: var(--tr-text);
}

.tr-drop-zone {
    border: 2px dashed var(--tr-border);
    border-radius: 16px;
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
    background: var(--tr-surface);
    position: relative;
}
.tr-drop-zone:hover,
.tr-drop-zone.dragover {
    border-color: var(--tr-accent);
    background: #2e3440;
}
.tr-drop-zone input[type="file"] {
    display: none;
}
.tr-drop-zone .icon {
    font-size: 2.8rem;
    display: block;
    margin-bottom: 8px;
}
.tr-drop-zone .main-text {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 4px;
}
.tr-drop-zone .sub-text {
    font-size: 0.85rem;
    color: var(--tr-text-secondary);
}
.tr-drop-zone .browse-btn {
    display: inline-block;
    margin-top: 12px;
    padding: 8px 20px;
    background: var(--tr-accent);
    color: #0e1013;
    border-radius: 30px;
    font-weight: 500;
    transition: background 0.2s;
    cursor: pointer;
    border: none;
}
.tr-drop-zone .browse-btn:hover {
    background: var(--tr-accent-hover);
}

.tr-file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    padding: 10px 0 6px 0;
    border-bottom: 1px solid var(--tr-border);
    margin-top: 8px;
    flex-wrap: wrap;
    gap: 6px;
}
.tr-file-info .name {
    font-weight: 500;
    word-break: break-all;
}
.tr-file-info .meta {
    color: var(--tr-text-secondary);
    font-size: 0.8rem;
    display: flex;
    gap: 12px;
}
.tr-file-info .meta span {
    white-space: nowrap;
}

.tr-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 12px 0 8px 0;
    flex-wrap: wrap;
}
.tr-controls button {
    background: var(--tr-surface);
    border: none;
    color: var(--tr-text);
    font-size: 1.4rem;
    padding: 8px 12px;
    border-radius: 40px;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
}
.tr-controls button:hover {
    background: #323842;
}
.tr-controls button:active {
    transform: scale(0.94);
}
.tr-controls button.active {
    color: var(--tr-accent);
}
.tr-controls button.disabled {
    opacity: 0.4;
    pointer-events: none;
}

.tr-timeline {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 8px 0 12px 0;
}
.tr-timeline input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 4px;
    background: var(--tr-border);
    outline: none;
    transition: background 0.2s;
}
.tr-timeline input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--tr-accent);
    cursor: pointer;
}
.tr-timeline input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--tr-accent);
    cursor: pointer;
    border: none;
}
.tr-timeline .time {
    font-size: 0.85rem;
    color: var(--tr-text-secondary);
    min-width: 48px;
    text-align: center;
}

.tr-volume-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 6px 0 14px 0;
}
.tr-volume-row .vol-icon {
    font-size: 1.1rem;
    color: var(--tr-text-secondary);
}
.tr-volume-row input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 4px;
    background: var(--tr-border);
    outline: none;
    max-width: 160px;
}
.tr-volume-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--tr-accent);
    cursor: pointer;
}
.tr-volume-row input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--tr-accent);
    cursor: pointer;
    border: none;
}
.tr-volume-row .mute-btn {
    background: transparent;
    border: none;
    color: var(--tr-text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px 6px;
}
.tr-volume-row .mute-btn:hover {
    color: var(--tr-text);
}
.tr-volume-row .vol-label {
    font-size: 0.8rem;
    color: var(--tr-text-secondary);
    min-width: 36px;
}

.tr-modes {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 10px 0 6px 0;
}
.tr-modes .mode-btn {
    background: var(--tr-surface);
    border: 1px solid var(--tr-border);
    border-radius: 30px;
    padding: 6px 16px;
    font-size: 0.85rem;
    color: var(--tr-text-secondary);
    cursor: pointer;
    transition: 0.15s;
    font-weight: 500;
}
.tr-modes .mode-btn:hover {
    background: #323842;
}
.tr-modes .mode-btn.active {
    background: var(--tr-accent);
    color: #0e1013;
    border-color: var(--tr-accent);
}
.tr-modes .mode-btn.active:hover {
    background: var(--tr-accent-hover);
}
.tr-modes .mode-label {
    font-size: 0.8rem;
    color: var(--tr-text-secondary);
    align-self: center;
    margin-right: 4px;
}

.tr-info {
    margin-top: 16px;
    border-top: 1px solid var(--tr-border);
    padding-top: 16px;
    font-size: 0.9rem;
    color: var(--tr-text-secondary);
}
.tr-info strong {
    color: var(--tr-text);
}
.tr-info .highlight {
    background: #2e3440;
    padding: 2px 8px;
    border-radius: 12px;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--tr-accent);
}

@media (max-width: 480px) {
    .tr-stereo-difference-app {
        padding: 16px 12px;
    }
    .tr-controls button {
        font-size: 1.2rem;
        min-width: 38px;
        min-height: 38px;
        padding: 6px 10px;
    }
    .tr-modes .mode-btn {
        font-size: 0.75rem;
        padding: 4px 12px;
    }
    .tr-timeline .time {
        min-width: 38px;
        font-size: 0.75rem;
    }
}

.tr-stereo-difference-loading {
    text-align: center;
    padding: 30px 0;
    color: var(--tr-text-secondary);
}

.tr-message {
    padding: 10px 14px;
    border-radius: 12px;
    margin: 10px 0 0 0;
    font-size: 0.9rem;
    background: #2a2f3a;
    color: var(--tr-text);
}
.tr-message.error {
    background: #3d1f2a;
    color: #ffb3b3;
    border-left: 4px solid #d32f2f;
}
.tr-message.warning {
    background: #3d3420;
    color: #ffe0a0;
    border-left: 4px solid #f57c00;
}
.tr-message.info {
    background: #1f2a3d;
    color: #b0c4ff;
    border-left: 4px solid #1976d2;
}